I enjoy collecting banknotes, coins, stamps and antique items. I just the ordinary person like you that want to share my little experience and collections.

Tuesday, May 4, 2010

Linesman Telephone - TMC 1705

I think this Linesman phone belong to RTM (Radio TV Malaysia) serviceman or engineer (since it got RTM mark on the top of the cover). It is a nice rotary type linesman phone for your display cabinet or collection

GENERAL DESCRIPTION OF LINESMAN TELEPHONE

The Linesman’s telephone is a portable instrument, suitable for connexion to alltypes of exchange line and designed for use by maintenance and fieldengineers.A three-position slider switch enables the internal battery to be switched in andout of circuit and in the non-locking position of this switch, connects ringingcurrent from the transistorised generator to the line terminals. A jack is providedso that a headset (Pye TMC Headset S 508640) Cat.No. A437 can be plugged inand used as an alternative to the handset and two sockets enable the outputfrom a tone amplifier to be connected to this receiver.A polyurethane-impregnated nylon carrying case (Pye TMC Cat: No. A424) mayalso be used to give additional protection in use in very rugged conditions.INSTALLATION1. Batteries. Three dry cells U2, R20 or equivalent (fully sealed types only)should be used . Unscrew the cap on the side of the instrument and insertthe batteries ensuring they are correctly in series, outer end positive (+ ve).Make periodic checks to make sure that cells are in good condition and notleaking.2. Connection to Line: When the telephone is connected to a pair in a cablethat contains working circuits, disturbance to that circuit can be limited asfollows:-a) Set the three-position slider switch in the C.B. position and connecttelephone to line.b) 704 telephone. Isolate the transmitter before removing handset from itscradle by pressing the button on the handset. 1705 telephone. It is notnecessary to press the handset button to isolate the transmitter as thismodel has a press to speak action.c) Check that the line is not in use.OPERATION1 . Central Battery and Automatic Workinga) Check as in paragraph above that the line is not in use.b) If line is not in use, release or press transmitter button as appropriate.c) Dial the required number or make request to operator if on CBexchange line.d) When headset is used, replace the handset in its cradle after thenumber has been dialled. To clear the line, remove the headset plugfrom socket.

2 . Local Battery WorkingWhen communication is required between two telephones proceed as follows:-a) Set the three-position slider switch to the LB position; the internalbattery is now in circuit.b) Connect the telephone to the line.c) Push the slider switch to the ‘RING’ position to call the other station. Atone will be heard in the receiver.d) Arrange with the other party which battery is to be in circuit as it is onlynecessary for one internal battery to be in use, therefore one telephoneshould have the slider switch in the LB (battery in circuit) position andthe other telephone should be switched to the CB (battery out of circuit)position.e) To conserve battery and receive incoming calls always replace handsetor remove headset plug from socket.3 . Tone AmplifierA tone amplifier may be used to identify cable pairs. The tone can be heard inthe telephone headset if the output of the amplifier is connected to the sockets inthe linesmans telephone.